Normaly if we make box using BUT1, the layer inside box is
But many times it happens that I can not select any layer..
I have installed micromagic in linux system..
I assume that this has to do with MAX. If you have layout and draw a box around it with BUT-1 it should make all of the layers inside of the box selected. There are a few cases where this won't happen. If the layer is not in the edit cell, e.g. if it is in a sub cell, it will not be selected. Also, you can turn off selection on a layer or all layers in the palette. Move the cursor over a layer in the palette and look in the message window, it will tell you how to change selectivity.