Let’s assume I’ve a Form and it contains a ToolStrip. In the Form1.Designer.cs file I can see the following to lines:

this.toolStrip1.ResumeLayout(false);
this.toolStrip1.PerformLayout();

Let’s assume I generate a custom ToolStrip using the following code:

[Designer(typeof(System.Windows.Forms.Design.ControlDesigner))]
public class MyToolStrip : ToolStrip
{
}

see WinForms ToolStrip not available in visual inheritence

If I use now MyToolStrip instead of ToolStrip in my Form then the this.toolStrip1.PerformLayout() line is removed from the designer file. Why? And how can I bring it back without editing every time the designer file which I shouldn’t do?

If the line is missing the size of some controls is not right, e.g.: ToolStripComboBox

Se as well C#: Does ResumeLayout(true) do the same as ResumeLayout(false) + PerformLayout()?