[C] Fix typo (#29379)

major facepalm

- fixes #29336

Author: StephaneDelcroix

src/Controls/src/Core/BindableObject.cs

@@ -482,7 +482,7 @@ public void SetValue(BindableProperty property, object value)
 			if (property == null)
 				throw new ArgumentNullException(nameof(property));
 
-			if (value is BindingBase binding && !property.ReturnType.IsAssignableFrom(typeof(BindableProperty)))
+			if (value is BindingBase binding && !property.ReturnType.IsAssignableFrom(typeof(BindingBase)))
 			{
 				SetBinding(property, binding);
 				return;

src/Controls/tests/Core.UnitTests/ItemDisplayBindingTests.cs

@@ -0,0 +1,48 @@
+using Xunit;
+
+namespace Microsoft.Maui.Controls.Core.UnitTests
+{
+	public class ItemDisplayBindingTests
+	{
+
+		class TestViewModel
+		{
+			public string Name { get; set; }
+			public string Description { get; set; }
+		}
+
+		class TestView : View
+		{
+			internal Picker picker = new Picker();
+			public static readonly BindableProperty ItemDisplayBindingProperty = BindableProperty.Create(nameof(ItemDisplayBinding), typeof(BindingBase), typeof(TestView), propertyChanged: (bindable, _, newValue) =>
+			{
+				if (bindable is TestView view)
+				{
+					view.picker.ItemDisplayBinding = (BindingBase)newValue;
+				}
+			});
+
+
+			public BindingBase ItemDisplayBinding
+			{
+				get => (BindingBase)GetValue(ItemDisplayBindingProperty);
+				set => SetValue(ItemDisplayBindingProperty, value);
+			}
+		}
+
+		[Fact]
+		public void TestItemDisplayBinding()
+		{
+			var testView = new TestView();
+
+
+			var binding = new Binding("Name");
+			testView.ItemDisplayBinding = binding;
+
+			Assert.Equal(binding, testView.ItemDisplayBinding);
+			Assert.Equal(binding, testView.picker.ItemDisplayBinding);
+		}
+				
+
+	}
+}