Problem in MouseMove Event

[Gamalof]

i want to Get the position( x,y) of the cursor moving on my custom QGraphicsView Control

So, i made new class "MyQGraphicsView : QGraphicsView"

then i defined and implemented "mouseMoveEvent"

in MyQGraphicsView .h

void mouseMoveEvent ( QMouseEvent * event);

void mouseMoveEvent ( QMouseEvent * event);

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in MyQGraphicsView.cpp

void MyGraphicsViwer::mouseMoveEvent ( QMouseEvent * event ) 
{
	MainForm->ui.Txt_xValue->setText((QString::number)(x()));
}

void MyGraphicsViwer::mouseMoveEvent ( QMouseEvent * event ) 
{
	MainForm->ui.Txt_xValue->setText((QString::number)(x()));
}

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the problem is in the first mouse move, the Txt_xValue displays value 100, then it doesn't change where ever the mouse moves.

So ?

Thanks