I am just attempting to make a simple fully constrained, dimension driven cabinet and I am wondering if there is a setting to turn on automatic constraints. In the first image I have selected the top of the side panel as the surface I want to work on. In the second image I am activating the sketch tool and selecting the rectangle tool. In the third image I want the first point of the rectangle to snap or automatically coincident constrain to the corner of the panel. Is this possible? I know I can use colinear constraints after initial placement, but that seems excessive.