calling B1-Motion and Leave events symontaneously?

Hi,

 

I am trying to implement lasso ; selection technique to select a set of rectangles on a canvas. When the usr leaves a rectangle while ;B1 is down the current rectangle is either selected or reselected. So I need to use two events:

<B1-motion> bound to the canvas  and <Leave&gt; bound to rectangles. But only B1-motion event is called.&nbsp; Does anyone know what the problem is and how

to call B1-motion&nbsp;and  Leave  symontaneously?

&nbsp;

Thanks,

Mina