Set template for the block (use css templates) while editing the block

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Hello,

I try to set the custom template for the Block while editing the block. I think its easyer.

How can I get the list of all custom templates for the block in my customized block? I mean all in the package and all in the applicatin directory.

I use concrete5 Version 5.7.5.9

Thank you in advance

GunterSchmitt