Press-and-hold right-click conflicts with Manipulation events

Question

I'm using the Manipulation events ( IsManipulationEnabled , ManipulationDelta , etc) to move and zoom an image. This works fine. I also want to use right-click to create a rectangle of selection to define a zone (drag and drop, the usual way, only with right-click) on the image. It works fine using the mouse on both touch (Surface) and non-touch (Win 7) devices. Though, when "right-clicking" on the Surface (therefore tap and hold with a finger), I see the typical little square appearing, but when I move my finger after that, it moves the image, instead of drawing the rectangle. It looks as if the Manipulation events have priority over the "finger right click". What am I doing wrong ?

 <Grid
    Name="theGrid"
    MouseMove="OnMouseMove"
    MouseRightButtonUp="theGrid_MouseRightButtonUp"
    MouseRightButtonDown="theGrid_MouseRightButtonDown"
    Background="Black">

    <Rectangle Name="RectangleContainingBackgroundImage"
               IsManipulationEnabled="True"
               RenderTransform="{Binding Path=ImageTransform}">
        <Rectangle.Fill>
            <ImageBrush x:Name="BackgroundImage" Stretch="Uniform"/>
        </Rectangle.Fill>
    </Rectangle>

At start :

ScreenTouchManager touchManager = new ScreenTouchManager(this.theGrid);
this.RectangleContainingBackgroundImage.ManipulationStarting += touchManager.Image_ManipulationStarting;
this.RectangleContainingBackgroundImage.ManipulationDelta += touchManager.Image_ManipulationDelta;
this.DataContext = touchManager;

In ScreenTouchManager :

public void Image_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
{
    // Ask for manipulations to be reported relative to the grid
    e.ManipulationContainer = this.ManipContainer; // MC = constructor param
}

Thank you.

Answer 1

I did a research and may find a answer here: http://www.mobilemotion.eu/?p=1396&lang=en

The VisualState changes are triggered by dedicated mouse events: For example, the Pressed state is reached when the button's OnMouseLeftButtonDown event occurs. The finger touch-and-hold event is usually mapped to a click with the right mouse button (when tapping on the screen and not instantly releasing the finger, Windows interprets this as right-click operation) – the OnMouseLeftButtonDown event never fires, and the Pressed state is never reached!

Hope this helps.