This one problem gives much headache for many days...In assembly a part is assembled in such a  which can rotate in double axes i.e dual rotational plane..

But the problem is by mouse dragging (left button) it shows rotation only about one axis(one rotational plane)..in other axis it wont show any rotational activity..but when i tried to rotate it with my right mouse button it rotates just fine.. i mean with right mouse button the part rotates about 2 axis very well...but with Left mouse button it only rotates about one axis...with left mouse button to rotate it in another axis i have to lock the rotation (in concentric mate) in previous axis....after that it showed rotation in other axis

why it happens??