Method onCreate

tools/xsbug/FilePane.js:175–178

(column, data)

		return BreakpointHeader(this.data, {left:0, right:0, top:0, height:column.first.height});
	}
	onCreate(column, data) {
		this.data = data;
		this.expand(column, data.expanded);
	}
	onBreakpointsChanged(column, data) {
		var data = this.data;
		this.expand(column, data.expanded);