with (Maplets[Elements]):
maplet := 
Maplet('onstartup'='Action1','reference'='Maplet1',
	Action('reference'='clickButton4',
		Evaluate('function'='op([{solve({diff(TextField1,x) = 0},{x})}])','target'='MathMLViewer1','waitforresult'='true')),
	MathMLViewer('background'="#FFFFFF",'fontsize'='16','foreground'="#000000",'height'='100','reference'='MathMLViewer1','width'='400'),
	Label('background'="#D6D3CE",'caption'="Zadejte funkci jedné proměnné f(x):",'enabled'='true','foreground'="#000000",'reference'='Label1','visible'='true'),
	TextField('background'="#FFFFFF",'editable'='true','enabled'='true','foreground'="#000000",'halign'='left','reference'='TextField1','visible'='true','width'='20'),
	BoxLayout('background'="#D6D3CE",'border'='false','halign'='center','inset'='5','reference'='BoxLayout2','valign'='center','vertical'='true','visible'='true',
		BoxRow(
			BoxCell('hscroll'='never','value'='Label1','vscroll'='never'),
			BoxCell('hscroll'='never','value'='TextField1','vscroll'='never'))),
	Button('background'="#D6D3CE",'caption'="Stacionární body",'enabled'='true','foreground'="#000000",'onclick'='clickButton4','reference'='Button4','visible'='true'),
	Button('background'="#D6D3CE",'caption'="Konec",'enabled'='true','foreground'="#000000",'onclick'='Action9','reference'='Button3','visible'='true'),
	BoxLayout('background'="#D6D3CE",'border'='false','halign'='center','inset'='5','reference'='BoxLayout6','valign'='center','vertical'='true','visible'='true',
		BoxRow(
			BoxCell('hscroll'='never','value'='Button4','vscroll'='never'),
			BoxCell('hscroll'='never','value'='Button3','vscroll'='never'))),
	BoxLayout('background'="#D6D3CE",'border'='false','halign'='center','inset'='5','reference'='BoxLayout1','valign'='center','vertical'='false','visible'='true',
		BoxColumn(
			BoxColumn(
				BoxCell('hscroll'='never','value'='MathMLViewer1','vscroll'='never')),
			BoxColumn(
				BoxCell('hscroll'='never','value'='BoxLayout2','vscroll'='never')),
			BoxColumn(
				BoxCell('hscroll'='never','value'='BoxLayout6','vscroll'='never')))),
	Window('layout'='BoxLayout1','reference'='Window1','resizable'='true','title'="Maplet"),
	Action('reference'='Action1',
		RunWindow('window'='Window1')),
	Return('reference'='Return1'),
	Action('reference'='Action9',
		Shutdown(`return`='Return1'))):

Maplets[Display](maplet);