can't put uibutton over a 2d unity sprites

[pcutile]

can't put a simple button (i need several..) on top of my Unity 2d sprites. why this? i acn't use it to make a simple joystick with button because there are always sprites that are drawed first of the button.

[ArenMook]

You can't mix different UI systems. Stick with one.

NGUI's geometry is drawn using a camera, and Unity's UI is drawn on top of everything else, unless you force it to use a camera as well. Only then can you make it be drawn behind NGUI.

You can draw Unity 2D sprites using NGUI's UI2DSprite component (ALT+SHIFT+D).