Control proportions different between runtime and designer

Question

i'm currently modifying an existing C# WinForm project. I try to arrange some controls inside a GroupBox. However on runtime, they seem to be aligned differently and the Groupbox has a lot more space. Is there some option checked or is this the standard behavior? Any hints are highly appreciated! Thanks!

Here is what it looks like, as you can see there is no way except trial and error to arrange the checkboxes. On runtime there is easily enough space to have four colums in one row, in designer i can hardly fit three without having them overlap.

Answer 1

To prevent the groupbox to resize according to its content, you should make GroupBox.AutoSize to false.

 GroupBox groupBox = new GroupBox();
 groupBox.AutoSize= false;