increase size of appHeader and appIcon in Shell

Hi,

I'm trying to use the "new sap.ui.ux3.Shell" feature in SAPUI5 and I want increase the size of the Image and Header, and I cant figure out how to do it.

var oShell = new sap.ui.ux3.Shell("mainShell", {  appIcon:"http://www.sap.com/global/images/SAPLogo.gif",  appTitle:  "RDS Use Cases"
});

I'd like the size to be similar to when the setLogoSrc and setLogoText is used in "sap.ui.commons.ApplicationHeader".

Can anyone help me?

Thanks!