Hi Radu,
The VBox control builds the container for a vertical flexible box layout. VBox is a convenience control as it is just a specialized FlexBox control.
Browser support: This control is not supported in Internet Explorer 9!
Something I found on the api page.
Also you could fix this problem.
var content = new sap.m.Text({
text: "ljkdfasjfdlassdfhl fdlaskfhsdlafhsdlkafhsdklajhfkldjhfaljdfh l lfhasdjklahfdlash ldfksah ldshflksdah lfhlksfh lkashlk alk lshfls ahfldsahfdlashflasjhflaskhf las llasfhlsajfhlsd hlas hflsa hflshfl ahflafs ljkdfasjfdlassdfhl fdlaskfhsdlafhsdlkafhsdklajhfkldjhfaljdfh l lfhasdjklahfdlash ldfksah ldshflksdah lfhlksfh lkashlk alk lshfls ahfldsahfdlashflasjhflaskhf las llasfhlsajfhlsd hlas hflsa hflshfl ahflafs ljkdfasjfdlassdfhl fdlaskfhsdlafhsdlkafhsdklajhfkldjhfaljdfh l lfhasdjklahfdlash ldfksah ldshflksdah lfhlksfh lkashlk alk lshfls ahfldsahfdlashflasjhflaskhf las llasfhlsajfhlsd hlas hflsa hflshfl ahflafs"
});
Dont use VBox.
JS Bin - Collaborative JavaScript Debugging
Regards,
Naren L Naik