C#: Anchored Panel won't resize properly

c# winforms controls
Jan-Patrick Ahnen picture Jan-Patrick Ahnen · Feb 1, 2010 · Viewed 19.9k times · Source

I've a strange problem regarding auto sizing of a panel in a user control. This panel is anchored to all 4 sides of the user control. But the anchoring not always works as it should:

If the user control is resized by resizing the form, the right and bottom anchors don't work. But if the control is resized by using a splitter which is in the form, it works correctly. All other controls which are also affected by resizing work correctly, just this panel won't do.

I can't see the difference between resizing through a splitter and through a form.

Setting the size manually in the OnResize of the UserControl only works if the resizing is done by moving the splitter. If the resizing occurs by resizing the form, the heigth and the width of the panel won't change to the new values.

Edit: To make it more clear: The user control is added to a TabPage and set to Dock=DockType.Fill.

Edit2: To make it more complicated: This is the hierarchy the control is used: The Form contains a splitter with 2 controls (A and B). (B) contains a user control (C) with a splitContainer. The split container->panel1 in (C) contains a tabcontrol (D). This tabcontrol (D) contains a user control (E) (in a tabpage) . This user control (E) has a splitcontainer (F) in which another usercontrol with a tabControl (G) is placed. This tabcontrol (G) has tabpages, and in this pages is the described user control (H) placed.

If I place the control (H) directly to the panel in the splitcontainer (C) everything works fine. Since all controls which are added to a splitcontainer or a tabpage are set to docktype=fill, I cannot see why the last control has this problems.

Is there any limitation in the Windows Forms framework which limits the amount of child controls?

Edit: I have uploaded a TestApplication with which you can reproduce this issue. http://rapidshare.de/files/49092516/TestApplication.zip.html It occurs only under Vista. Win XP and 7 work properly... If you resize the form, the textBox with the "..." button won't resize, but if you resize via the vertical splitContainer, it works.

Answer

Nick picture Nick · Mar 24, 2010

There is a bug with deep nesting where the kernel runs out of stack space causing resizing, docking and anchoring to fail silently.

See https://web.archive.org/web/20140818095718/http://support.microsoft.com/kb/953934

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