(First, how does one turn off double-spacing in this editor control!??!?)
Anyhow, Look at the following images:
There is only one difference between the two projects/images. In the first image, the TabControl/TabPage isn't on a HeaderedPanel.
(The project consists of -- A toolbar (docked top), A statusbar (docked bottom), TabControl/TabPage (docked fill) <-- not on a HeaderedPanel (1st image), on a HeaderedPanel (2nd image))
Now, each Panel (the colored squares) is 100 in Height. In the first image you can see that I can fix 6 100 Height Panels. The "tabs" of the tabcontrol must be 23 pixels. That's why you see 623 for the height (and it also points out the bug I submitted last week - those two numbers shouldn't be the same).
The second image, the one with the Headered Panel shows us that we can't fit 6 100 Height Panels. But meanwhile, it still shows a Height of 623. Which isn't right.
HeaderedPanel's are causing an incorrect Height for it's subordinate controls.
Now, this is a stripped down project. In my real project, the Height is off by something like 100 pixels (because on the Tab is a UserControl with two toolbars (25 height) and *another* TabControl). Something here is not right.
I will send the two projects to support.
EDIT: [Using 6.4b] and projects sent to firstname.lastname@example.org