Oversized controls can prevent window resizing in the visual designer

If a UI control is placed on a window in the visual designer and resized to overlap the left/bottom bounds of the containing window, it is no longer possible to resize the window in the visual designer with the mouse because you cannot "grab" the edge of the window.

Steps to reproduce:

1. Create new project.
2. Add a canvas to Window1.
3. Set the position of the newly added canvas to (left, top, width, height) of (0, 0, 800, 600) exactly matching the containing Window1's frame.
4. Now you can't resize the window because the grab bounds of Window1 are hidden by the canvas.

What should happen:

It should be possible to select the window by clicking either on the window's title bar or by clicking anywhere on the designer's canvas that does not contain another control.

Additional changes:

We should add to the visual designer's contextual menu (when clicking the designer's canvas or the window's title bar) to menu items:

• Select All (this would select all controls in the designer)
• Select > (this would then display the names of each individual control on the window as sub items that could be selected).