CHANGING JOINING TYPE OF GLYPHS

HELLO EVERYBODY
DOES ANYBODY KNOW HOW TO SET A GLYPH'S JOINING TYPE IN FONTLAB STUDIO 5.0.
I HAVE ADDED A GLYPH TO A FONT OF ARABIC . IT IS A NEW CHARACTER AND UNICODE HAS INCLUDED IT IN ARABIC SCRIPT IN 2012.IT IS A DUAL- JOINING GLYPH . I HAVE ENCODED IT AND GIVEN IT PROPER NAME . BUT I DONT KNOW HOW TO SET ITS JOINING TYPE.IT IS EXPECTED TO JOIN WITH OTHER CHARACTERS IN A WORD AND SUBSTITUTE ITS MEDIAL FORM IN MEDIAL POSITION.BUT IT DOES NOT JOIN WITH OTHER CHARACTERS AND REMAINS IN AN ISOLATED FORM.THAT MEANS ITS CURRENT JOINING TYPE IS U (NON -JOINING).

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