[Q] Mod png in framework.apk

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http://forum.xda-developers.com – I have edited some png files in photoshop in framework.apk like: btn_default_normal.9.png btn_default_normal_disable.9.png btn_default_pressed.9.png ... but when I put in the phone, it does not automatically adjust the size line that stretched out look very bad, it cracked .... Example: there is a table popup message that says "you want to delete it" as normal phone will adjust for the surrounding btn_default_normal.9.png all the words "you want to delete it", but when you just change the color of it, not resize it, then put it back when the popup it still load the picture (HowTos)