I used a grid to layout components. Following style is applied.

<style>
	.z-grid-body { overflow: hidden !important; }
</style>

I had to add the "!important", because the grid would sometimes display unnecessary scroll bars. Setting overflow: hidden would not be enough because the z-grid-body has overflow: auto as ELEMENT STYLE. Even the default CSS for z-grid-body defines overflow: hidden, but it is overriden by the element style. Adding hidden !important again fixes it and really disables scrolling.

So the problem here is the style="overflow:auto" on z-grid-body.

Example to test:

<zk>
	<grid>
		<columns>
			<column />
			<column />
		</columns>

		<rows>
			<row>
				hello
				<textbox />
			</row>
			<row>
				world
				<textbox />
			</row>
		</rows>
	</grid>
</zk>

See attached file for screenshot and final css. Note how the hidden of .z-grid-body is overriden by element style.