Add usage hints to lower/middle/upper-specific sidedef texture search

Source/Plugins/BuilderModes/FindReplace/FindSidedefLowerTexture.cs

@@ -17,6 +17,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		#region ================== Properties
 
 		public override Image BrowseImage { get { return Properties.Resources.List; } }
+		public override string UsageHint
+		{
+			get
+			{
+				return "Supported wildcards:" + System.Environment.NewLine
+						+ "* for zero or more characters" + System.Environment.NewLine
+						+ "? for exactly one character";
+			}
+		}
 
 		#endregion
 

Source/Plugins/BuilderModes/FindReplace/FindSidedefMiddleTexture.cs

@@ -17,6 +17,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		#region ================== Properties
 
 		public override Image BrowseImage { get { return Properties.Resources.List; } }
+		public override string UsageHint
+		{
+			get
+			{
+				return "Supported wildcards:" + System.Environment.NewLine
+						+ "* for zero or more characters" + System.Environment.NewLine
+						+ "? for exactly one character";
+			}
+		}
 
 		#endregion
 

Source/Plugins/BuilderModes/FindReplace/FindSidedefUpperTexture.cs

@@ -17,6 +17,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		#region ================== Properties
 
 		public override Image BrowseImage { get { return Properties.Resources.List; } }
+		public override string UsageHint
+		{
+			get
+			{
+				return "Supported wildcards:" + System.Environment.NewLine
+						+ "* for zero or more characters" + System.Environment.NewLine
+						+ "? for exactly one character";
+			}
+		}
 
 		#endregion