How to execute commandbar control?

Hi everyone,
I am trying to create 2 Powerpoint VBA Subs to insert shapes: 1 to insert the line arrow double im1.png, 1 to insert the flow chart merge im2.png (as both cannot be found in the commands to customize the ribbon for some reason)
I managed to create the second one in Excel but Powerpoint throws me an error: method of execute object failed. The first one while I found the control is not executing on neither application

What should I do please? I noticed in Powerpoint both items under their respective commandbars have a "false" property in "enabled" (which I cannot force to true)

Many thanks for your help,

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Thanks for your answer WBD. The thing with your method is that position and size are pre-defined. Whereas using commandbar is like clicking on the button in the shapes menu where you can position the arrow/ triangle wherever you like (as opposed to adjusting the one created) :-/

Up! An idea anyone please? I am trying to replicate what an existing command is doing (to have the buttons in my personalized toolbar instead of having to dig into the shapes button). I imagine there is a solution existing :-/