How to call DrawItem manually??

I have a dialog which has 10 buttons in it.
And those buttons are drawn with their own background image.
So, I draw them by using DrawItem function which is called when invalidate func is called or the button status is changed.

To call DrawItem function, I call invalidate(), but
all of controls are updated, I mean whenever invalidate() is called, the
all buttons blink.

So, i want to call DrawItem() of a button I need to update.

Is it possible to do that?

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