After the window in the normal invoked

 this. WindowState=FormWindowState. Minimized; 

But when click on the task bar icon to restore the window a large part did not draw up the
Currently seems to be only background plate. Don't draw and as long as other BackColor is not Color Transparent components to be able to normal display
Form background is Color Dodgerblue background plate is Color. White + image neither normal map

At present because it seems as if the background plate set the Image as long as cancel background images can normal map
What's the solution