Hello again,
im not 100% sure but i guess there is a problem with the resizing of multiselect items which are in a panel with the layout type: hbox.
here is my (not working so well) example 
PHP Code:
multiSelectCustomer = new Ext.ux.form.MultiSelect ({
id: 'customer',
name: 'customer',
store: storeCustomer,
valueField: 'marktnummer',
displayField: "Ort",
blankText: 'No customers to display',
//width: 364,
//height: 270
})
multiSelectProduct = new Ext.ux.form.MultiSelect ({
id: 'product',
name: 'product',
store: storeProduct,
valueField: 'Medianummer',
displayField: 'artikelname',
blankText: 'No products to display',
//width: 364,
//height: 270
})
spanel = new Ext.Panel ({
id: 'spanel',
title: 'just a test',
layout: 'hbox',
layoutConfig: {
align: 'stretch',
pack: 'start'
},
defaults: {
flex:1
}
})
/*** push MultiSelect into the spanel ***/
arrMultiSelect = new Array();
arrMultiSelect.push(multiSelectCustomer);
arrMultiSelect.push(multiSelectProduct);
spanel.add(arrMultiSelect);
I would be thankful for any help!
Best Regards Lars