C++ builder - dynamically created mousedown event

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C++

Builder

C++14

How to handle dynamically created form's MouseDown or MouseUp event? Using:

TMouse * event= dynamic_cast<TMouse*>(Sender);

does not throw any error but doesn't do the work either. According to C++ Builder's reference TMouseEvent is the function type for either an OnMouseDown event or an OnMouseUp event. I don't know what to do here.

Thanks in advance.

What I have tried:

This throws the error: E2031 Cannot cast from 'TObject*' to 'TMouseEvent'

void __fastcall TfMain::dyn_formMouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift,
	int X, int Y){
	TMouseEvent * event= dynamic_cast<TMouseEvent *>(Sender);
	if (event) {
		old_x = X;
		old_y = Y;
		mouseState = MOUSE_DOWN;
	}
}