Problems with assigning callback function in MEL

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Old 01 January 2013   #1
Problems with assigning callback function in MEL

Hey everyone!
I'm sure it's pretty dumb problem but i just can't figure it out.
I want my button to perform some action ( basically call other function with a parameter)

button -command("exportObjChan("+$mainBoxGroupUI+")")$mainBoxGroupUI ;

But no matter what mainBoxGroupUI is , i got the same error : "Invalid use of Maya object"

exportObjChan( string $value)
{}

Any suggestions are greatly appreciated! Thx^^
 
Old 01 January 2013   #2
you may need to put a pair of escaped quotes around your string.

button -command("exportObjChan(\""+$mainBoxGroupUI+"\")")$mainBoxGroupUI;
 
Old 01 January 2013   #3
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