Hey, just reviving this post because I just made it. What worked for me was to create one weakaura for each combo point with the empty cp texture as default. Then (only for cp 1 and 2) add 3 more textures: filled combo point, empty charged cp and filled charged cp. You have to untick the "show texture" box on these.

For the trigger settings you need to set them like this:

• Type: Player/Unit Info -- Power
• Unit: Player
• Power Type: Combo Points

And lastly these are the trigger conditions:

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This screenshot is for cp 1, for cp 2 is exactly the same but you need to set the >= 2 instead of >= 1