When moving the WPF window quickly, making a problem

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C#

XAML

WPF

Hi all,

Excuse me for previous posts. The problems was partly solved, but a new problem has arisen. When moving the WPF window with below method to around quickly, the window be leave from the mouse cursor! is there any idea!? please guide me.

public myWindow()
{
this.InitializeComponent();

Body3D.MouseLeftButtonDown += new MouseButtonEventHandler(Body3D_MouseLeftButtonDown);
Body3D.MouseLeftButtonUp += new MouseButtonEventHandler(Body3D_MouseLeftButtonUp);
Body3D.MouseMove += new MouseEventHandler(Body3D_MouseMove);
}
bool inDrag;
Point dragPoint;
 
private void Body3D_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{ 
	dragPoint = e.GetPosition(this);
	inDrag = true; 
}
 
private void Body3D_MouseMove(object sender, MouseEventArgs e) 
{
	if (inDrag)
	{
		Point pointMoveTo;
 
		// Find the current mouse position in screen coordinates.
		pointMoveTo = this.PointToScreen(e.GetPosition(this));
 
		// Compensate for the position the control was clicked.
		pointMoveTo.Offset(-dragPoint.X, -dragPoint.Y);
 
		// Compensate for the non-client region (title bar).
		// This code is not necessary if you explicitly hide the title bar 
		// by setting the form's BorderStyle to None.
		//pointMoveTo.Offset(0, -25); //Move the window.

		this.Left  = pointMoveTo.X;
		this.Top = pointMoveTo.Y; 
	} 
} 
 
private void Body3D_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
	inDrag = false;
}} 

Notice: The Body3D is a ModelUIElement3D through
window
∟viewBox
∟viewPort3d
∟modelVisual3d
∟modelUIelement3d(body3D)
and some window properties set to Background="{x:Null}", AllowsTransparency="True" , WindowStyle="None".

Thanks a lot in advance.