[lazarus] Resizing window in Win32

[Martin Smat]

Hello,
when I try to resize a window with the LEFT UPPER corner under Windows 
win32 API, the window is not resized, it only moves into the position 
where I place the corner. It looks like the window sends message 
WM_WINDOWPOSCHANGED. This message is replaced with WM_SIZE and WM_MOVE 
messages in DefWindowProc. I suppose that the window is resized first 
but the new width and height values are forgotten and then the window is 
moved with the old width and height values.
Can anybody know why this happens? I can't find the right reason.

Martin Smat.