A draggable popup control in wpf

Question

I need a draggable popup control in wpf and was wondering if any of your guys could help me out..I did see the following post:

Drag WPF Popup control

but tha

Answer 1

We can write a behavior to make any Popup draggable. Here is some sample XAML of a popup associated with a textbox that opens and stays open when the text box is focused:

    
        
    
    
        
            
        
        
            Sample Popup content.
        
    

Here is the behavior that allows us to drag the Popup:

public class MouseDragPopupBehavior : Behavior
{
    private bool mouseDown;
    private Point oldMousePosition;

    protected override void OnAttached()
    {
        AssociatedObject.MouseLeftButtonDown += (s, e) =>
        {
            mouseDown = true;
            oldMousePosition = AssociatedObject.PointToScreen(e.GetPosition(AssociatedObject));
            AssociatedObject.Child.CaptureMouse();
        };
        AssociatedObject.MouseMove += (s, e) =>
        {
            if (!mouseDown) return;
            var newMousePosition = AssociatedObject.PointToScreen(e.GetPosition(AssociatedObject));
            var offset = newMousePosition - oldMousePosition;
            oldMousePosition = newMousePosition;
            AssociatedObject.HorizontalOffset += offset.X;
            AssociatedObject.VerticalOffset += offset.Y;
        };
        AssociatedObject.MouseLeftButtonUp += (s, e) =>
        {
            mouseDown = false;
            AssociatedObject.Child.ReleaseMouseCapture();
        };
    }
}

If you are not familiar with behaviors, install the Expression Blend 4 SDK and add this namespaces:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

and add System.Windows.Interactivity to your project.