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Treeview drives me crazy!I have a treeview control, which is docked on a panel. When I call the
procedure to fill this treeview from the load event it works fine. It loads all nodes, and displays them nicely. However, when I call the very same procedure at a later stage (after a login) then the nodes don't show. I traced with the debugger, and the nodes do get created, but when I check the IsVisible property, it is set to No. So, now comes the weirdest part... I cut the procedure that fills the treeview in two. The first part loads header nodes, which are the same for every user. I call this procedure from the load event. Then after the login I call the 2nd part, which adds child nodes to the previously created header nodes. When the form shows, the header nodes are shown, the later added child nodes are not. Again, they do exist, but I can't seem to make them visible... What's going on here? Tia, Martin Is the update procedure in the same thread context as the UI?
Show quoteHide quote "Martin" <x@y.com> wrote in message news:OoQira7MGHA.344@TK2MSFTNGP11.phx.gbl... >I have a treeview control, which is docked on a panel. When I call the >procedure to fill this treeview from the load event it works fine. It loads >all nodes, and displays them nicely. > > However, when I call the very same procedure at a later stage (after a > login) then the nodes don't show. I traced with the debugger, and the > nodes do get created, but when I check the IsVisible property, it is set > to No. > > So, now comes the weirdest part... I cut the procedure that fills the > treeview in two. The first part loads header nodes, which are the same for > every user. I call this procedure from the load event. Then after the > login I call the 2nd part, which adds child nodes to the previously > created header nodes. When the form shows, the header nodes are shown, the > later added child nodes are not. Again, they do exist, but I can't seem to > make them visible... What's going on here? > > Tia, > Martin > > > Hi Gregory,
Thanks for your reply. I'm a long-time VB6 programmer, just starting in VB2005 and I have to admit: I don't even know what a thread context is. However.. I did create a class which is instanced within my app as a seperate object, like a kind of "Handler". This handler is executing the method of the MDI container form to display the remaining nodes. But I don't think that would be a seperate thread, and the method to display these nodes is still in the MDI container form. Tia, Martin Show quoteHide quote "gregory_may" <None> wrote in message news:O3KcKB%23MGHA.2036@TK2MSFTNGP14.phx.gbl... > Is the update procedure in the same thread context as the UI? > > "Martin" <x@y.com> wrote in message > news:OoQira7MGHA.344@TK2MSFTNGP11.phx.gbl... >>I have a treeview control, which is docked on a panel. When I call the >>procedure to fill this treeview from the load event it works fine. It >>loads all nodes, and displays them nicely. >> >> However, when I call the very same procedure at a later stage (after a >> login) then the nodes don't show. I traced with the debugger, and the >> nodes do get created, but when I check the IsVisible property, it is set >> to No. >> >> So, now comes the weirdest part... I cut the procedure that fills the >> treeview in two. The first part loads header nodes, which are the same >> for every user. I call this procedure from the load event. Then after the >> login I call the 2nd part, which adds child nodes to the previously >> created header nodes. When the form shows, the header nodes are shown, >> the later added child nodes are not. Again, they do exist, but I can't >> seem to make them visible... What's going on here? >> >> Tia, >> Martin >> >> >> > > Hi Gregory,
That was the problem! Thanks for pointing me in the right direction. Martin Show quoteHide quote "gregory_may" <None> wrote in message news:O3KcKB%23MGHA.2036@TK2MSFTNGP14.phx.gbl... > Is the update procedure in the same thread context as the UI? > > "Martin" <x@y.com> wrote in message > news:OoQira7MGHA.344@TK2MSFTNGP11.phx.gbl... >>I have a treeview control, which is docked on a panel. When I call the >>procedure to fill this treeview from the load event it works fine. It >>loads all nodes, and displays them nicely. >> >> However, when I call the very same procedure at a later stage (after a >> login) then the nodes don't show. I traced with the debugger, and the >> nodes do get created, but when I check the IsVisible property, it is set >> to No. >> >> So, now comes the weirdest part... I cut the procedure that fills the >> treeview in two. The first part loads header nodes, which are the same >> for every user. I call this procedure from the load event. Then after the >> login I call the 2nd part, which adds child nodes to the previously >> created header nodes. When the form shows, the header nodes are shown, >> the later added child nodes are not. Again, they do exist, but I can't >> seem to make them visible... What's going on here? >> >> Tia, >> Martin >> >> >> > > This issue is a weird one. I manifests it self in strange ways. The .Net
framework seems to just blow apart with this issue. Show quoteHide quote "Martin" <x@y.com> wrote in message news:%236$RIMHNGHA.1424@TK2MSFTNGP12.phx.gbl... > Hi Gregory, > > That was the problem! Thanks for pointing me in the right direction. > > Martin > > "gregory_may" <None> wrote in message > news:O3KcKB%23MGHA.2036@TK2MSFTNGP14.phx.gbl... >> Is the update procedure in the same thread context as the UI? >> >> "Martin" <x@y.com> wrote in message >> news:OoQira7MGHA.344@TK2MSFTNGP11.phx.gbl... >>>I have a treeview control, which is docked on a panel. When I call the >>>procedure to fill this treeview from the load event it works fine. It >>>loads all nodes, and displays them nicely. >>> >>> However, when I call the very same procedure at a later stage (after a >>> login) then the nodes don't show. I traced with the debugger, and the >>> nodes do get created, but when I check the IsVisible property, it is set >>> to No. >>> >>> So, now comes the weirdest part... I cut the procedure that fills the >>> treeview in two. The first part loads header nodes, which are the same >>> for every user. I call this procedure from the load event. Then after >>> the login I call the 2nd part, which adds child nodes to the previously >>> created header nodes. When the form shows, the header nodes are shown, >>> the later added child nodes are not. Again, they do exist, but I can't >>> seem to make them visible... What's going on here? >>> >>> Tia, >>> Martin >>> >>> >>> >> >> > > 
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