SETCANVASBLENDMODE

SetCanvasBlendMode( c_num, blend_mode )

Set the blend_mode of a canvas
BLEND MODES
BLENDMODE_NONE - No Blending
BLENDMODE_BLEND - Alpha Blending
BLENDMODE_ADD - Additive Blending
BLENDMODE_MOD - Color Modulate

Example:

SetCanvasBlendMode(0, BLENDMODE_BLEND)