how do you set the default width of a tab?
By default the width of the tabs is the width of tabbar container.
You can change tabbar width using setSize(width,height,contentZone) method. For example:
tabbar.setSize(200,200);
Tabbar professional version allows to set automatic tabs width:
tabbar.enableAutoSize(true,false);
For more details, please, see documentation:
dhtmlx.com/docs/products/dht … alpha.html