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Message: [QUOTE="=?ISO-8859-1?Q?Grzegorz_Wr=F3bel?=, post: 9646397"] .... Put the minimal project that demonstrates the problem somewhere on the net. From MSDN about CS_SAVEBITS style: "Saves, as a bitmap, the portion of the screen image obscured by a window. The system uses the saved bitmap to re-create the screen image when the window is removed. The system displays the bitmap at its original location and does not send WM_PAINT messages to windows obscured by the window if other screen actions have not invalidated the stored image. Use this style for small windows that are displayed briefly and then removed before other screen activity takes place (for example, menus or dialog boxes). This style increases the time required to display the window, because the system must first allocate memory to store the bitmap." [/QUOTE]