Mouse dragging events in NSWindow and NSView

Hi, I have built and application that uses a single window that contains multiple components within it. The main component of the window is a custom NSView subclass that contains a number of CALayers. I want to be able to move these layers around the NSView subclass based on the mouseDown, mouseDragged, and mouseUp events entered by the user. I can detect and process mouse events fine within the NSView subclass, however, whenever I drag the mouse within the NSView subclass right after a mouseDown event, the WHOLE WINDOW will move. I do not want that to happen, that is, when I am dragging the mouse within my NSView subclass, I do not want the whole window to move. I want my CALayers, within the NSView, to move according to the mouse events that I am correctly tracking in the NSView subclass. I will very much appreciate any suggestions. Thank you very much in advance.