resiging controls at runtime

Question

Hi yall, I am new to customizing controls. I have windows form with controls from edge to edge (form is filled with controls). I want to implement resizing of the controls in the following way. - if i drag an edge of a control (#1) over the other control (#2) then the first control should be resized to the size of (#1+#2) control. for this requirement i am not able to drag a control's edge over the other control. all controls' sizes are multiples of a predefined height and width. Any help would be greatly appreciated. Thanks in advance Udaan