Start the project and minimize the window and than restore it again. Then the window is bigger.  

This are the sizes noticed in the frmMain_Resize event:

{Width=976, Height=590} --> Original size of the window

{Width=160, Height=28} --> Size when minimized

{Width=976, Height=590} --> Restoring the window, it has the same size as before

{Width=990, Height=627} --> This happens some milliseconds later. The window grows in the width for 14 points and in the height for 17 points every time.

{Width=160, Height=28} --> and so on....

{Width=990, Height=627}

{Width=1004, Height=664}

{Width=160, Height=28}

{Width=1004, Height=664}

{Width=1018, Height=701}

It happens with all styles.

This occurs with the current ActiveX version 19.2 and also with previous versions (e.g. 18.6). The MFC-version is ok.