how to make blocks show up with a button

[PolygonPenguin]

i want to have an advanced button that users can press to get more, more advanced, blocks

[CST1229]

Look at the code used in the Animated Text extension. Basically, set the hideFromPalette property of blocks to a value based on a variable, and have a Scratch.BlockType.BUTTON to toggle that variable.

[penta-quark-neutro]

example
{func:'herram1',blockType:Scratch.BlockType.BUTTON,hideFromPalette:!ops,text:'mostrar Operadores',}
{func:'herram2',blockType:Scratch.BlockType.BUTTON,hideFromPalette:ops,text:'ocultar Operadores',}
herram1(){ops=false;Scratch.vm.extensionManager.refreshBlocks();}
herram2(){ops=true;Scratch.vm.extensionManager.refreshBlocks();}