adding products to categories

this could use a lil more work i mean no offence by this but if u search even the letter a it shows all products in a pop up and dont get me wrong i like the pop up idea but this one is a lil glitchy, would be a awesome idea but maybe what is in the pop up is already in the edit categories page maybe that would make it less glitchy ( glitchy = once the pop up is open if u try to highlight anything to retype it,

it will force close