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Application-OnIdle gameloop?

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I implemented my gameloop like this:
__fastcall TMainForm::TMainForm(TComponent* Owner) : TForm(Owner)
{
    Application->OnIdle = IdleLoop;
    _control87(MCW_EM, MCW_EM);     // turn off floating point exceptions
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::IdleLoop(TObject*, bool& done)
{
    drawGame();
    SwapBuffers(hdc);
}


The result was not exactly what i wanted. The screen is only refreshed when the computer is idle, which takes sometimes more than 5 seconds. Impossible to do some animation that way. I did not find any other solution than writing a whole Window-class with its own handleMessages() routine. Any ideas how to solve this in a less drastic way? (I am using the vcl library)

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