<window mode="modal" closable="true">
	<grid>
	    <rows>
	        <row>
	            <vbox height="1800px">
	                <textbox width="400px" id="tb1Id" value="Please scroll down and click the Validate button"/>
	            </vbox>
	        </row>      
	        <row>
	            <textbox id="tb2Id" width="400px" constraint="no empty" />
	        </row>
	        <row>
	            <separator/>
	        </row>
	        <row>
	            <button label="Validate" width="150px" onClick="tb1Id.value = tb2Id.getValue()"/>
	        </row>
	    </rows>
	</grid>
</window>