If you want the search on the top toolbar without categorized combobox

You need to change in extnd-all :
after :
Code:
tbar: (this.toolbar || this.showActionbar || (this.showSingleCategory && this.showCategoryComboBox)) ? new Ext.Toolbar({
before :
Code:
tbar: ((!this.searchInPagingToolbar) || this.toolbar || this.showActionbar || (this.showSingleCategory && this.showCategoryComboBox)) ? new Ext.Toolbar({