WS_EX_TOOLWINDOW issue

On Dialog based application, if you create a new dialog(tool window), and you press alt-tab, you can see the main dialog, and the tool window is missing( that is ok, is what a tool window is made to do).

On sdi/mdi applications if you open a tool window and press alt-tab, the application disappear from task bar(mainframe too). And that is my problem . I want my mainframe to always appear on开发者_高级运维 task bar when I press alt-tab, even if a tool window is opened.

Any idea is appreciated.

Thank you.