class CustomCategory extends Blockly.ToolboxCategory {
/**
* Constructor for a custom category.
* @override
*/
constructor(categoryDef, toolbox, opt_parent) {
super(categoryDef, toolbox, opt_parent);
}
/** @override */
addColourBorder_(colour){
this.rowDiv_.style.backgroundColor = colour;
}
}
Blockly.registry.register(
Blockly.registry.Type.TOOLBOX_ITEM,
Blockly.ToolboxCategory.registrationName,
CustomCategory, true);
```
Anyways thanks for your reply
Jeffrey