Question

How is it possible to remove extra space in spark button?

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So i need the image or text starts exactly with left border of the button

Answer 1

You will need to define a new skin for your Button.
CSS:

s|Button {
   skinClass:ClassReference("skins.MySkin");
}

MySkin.mxml will be a copy of Flex\frameworks\projects\spark\src\spark\skins\spark\ButtonSkin.mxml

Then you can change the value left="10" for labelDisplay or add a BitmapImage called iconDisplay and set its left value.