Maximize MDI child form

Question

I\'m working on a legacy WinForms MDI application and have some trouble making the child forms behave as I want. My objective is to have the child form always maxim

Answer 1

This is how I overcame the same promblem, cannot remember where I found the code.

private const int WM_SYSCOMMAND = 0x112;
private const int SC_MINIMIZE = 0xF020;
private const int SC_MAXIMIZE = 0xF030;
private const int SC_CLOSE = 0xF060;
private const int SC_RESTORE = 0xF120;

protected override void WndProc(ref Message msg)
{
  if ((msg.Msg == WM_SYSCOMMAND) && 
    (((int)msg.WParam == SC_MINIMIZE) || ((int)msg.WParam == SC_MAXIMIZE) ||
    ((int)msg.WParam == SC_CLOSE)) || ((int)msg.WParam == SC_RESTORE))
    {
      //do nothing
    } // end if
    else
    {
      base.WndProc(ref msg);
     } // end else
}