I would like to promote an updated/simplified v16.2 solution for this task after introduction of the ActionBase > CustomizeControl event. To remind you the context, let me quote myself from the https://www.devexpress.com/kb=Q49798 thread:
"XAF allows defining whether a SingleChoiceAction click should show a dropdown or execute an action item immediately using the ShowItemsOnClick and DefaultItemMode properties. You can easily change these properties based on the number of the New action items. However, a triangle glyph is always shown by default. The SingleChoiceAction does not currently provide built-in means for replacing a dropdown with a simple button either. Currently, to improve user experience with such configurations, you can customize the underlying bar item in the YourSolutionName.Module.Win project.
You can use the following controller to hide a drop-down list from the NewObjectAction in case it contains only one element:
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.ExpressApp.Win.SystemModule;
using DevExpress.XtraBars;
...
namespace YourSolutionName.Module.Win.Controllers {
public class CustomizeNewActionController : WindowController {
BarButtonItem newActionBarButtonItem;
protected override void OnFrameAssigned() {
base.OnFrameAssigned();
WinNewObjectViewController newObjectViewController = Frame.GetController<WinNewObjectViewController>();
SingleChoiceAction newObjectAction = newObjectViewController.NewObjectAction;
newObjectAction.CustomizeControl += NewObjectAction_CustomizeControl;
newObjectAction.ItemsChanged += NewObjectAction_ItemsChanged;
}
private void NewObjectAction_ItemsChanged(object sender, ItemsChangedEventArgs e) {
if(newActionBarButtonItem != null) {
SingleChoiceAction newObjectAction = (SingleChoiceAction)sender;
int choicesCount = newObjectAction.Items.Count;
if(choicesCount == 1) {
newActionBarButtonItem.ButtonStyle = BarButtonStyle.Default;
}
}
}
private void NewObjectAction_CustomizeControl(object sender, CustomizeControlEventArgs e) {
newActionBarButtonItem = e.Control as BarButtonItem;
}
}
}Here are screenshots showing the results in the application UI before and after this customization.
Before:
After:
Also, you can use the same approach with the CloneObjectAction (it is a part of the CloneObjectViewController). Refer to the following documentation articles to learn more about this solution:
Concepts > Extend Functionality > Built-in Controllers and Actions
Concepts > Extend Functionality > Customize Controllers and Actions
Task-Based Help > How to: Customize Action Controls
DevExpress.XtraBars > BarButtonItem > ButtonStyle
DevExpress.XtraBars > BarButtonItem > ActAsDropDown
For older versions
Check out the How to display a dropdown without a triangle glyph for a SingleChoiceAction ticket for code examples."