Problem on guiTexture.pixelInset

hi there,

im trying to rewrite the values of my pixelInset.xMax like this, ## Code ## HPGUIGreen.guiTexture.pixelInset.xMax = HPGUIGreen.guiTexture.pixelInset.xMin + healthGUIWidthGreen

but i gets an error #Cannot modify a value type return value of `UnityEngine.GUITexture.pixelInset'. Consider storing the value in a temporary variable# and i make a variable to store the xMax value like this.

 TempStorage = HPGUIGreen.guiTexture.pixelInset.xMax;
             
 TempStorage = HPGUIGreen.guiTexture.pixelInset.xMin + healthGUIWidthGreen;

the errors gone, but when i did something like this, the xMax value of the were not dropping when i reduce the values of the healthGUIWidthGreen.

can any one tell me whats wrong with my code?

much thanks to those who read or reply.