paint thing

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I am making a sort-of MS Paint clone thing(just to see if I could do it)and I am have trouble with being able to draw anything :( I have tried(for the pencil tool):
If MouseDown(1) :Rect MouseX(),MouseY(),1,1,1:EndIf
and I have also tried: pencil=LoadImage("pencil.bmp")
If MouseDown(1) :DrawImage pencil,MouseX(),MouseY():Endif

But those don't seem to work :(
Anybody know?