B2026-085 Disable Symbols when leave a TextBox

ready for testing

PROMS/ReferencedObjects/LibSource/ctlXMLEditLib/ctlXMLEdit.cs

@@ -1220,6 +1220,11 @@ namespace ctlXMLEditLib
 					mytextbox.Enter += new System.EventHandler(this.txtBox_Enter);
 					mytextbox.Leave += new System.EventHandler(this.txtBox_Leave);
 				}
+				else
+				{
+                    //B2026-085 Disable Symbols when leave a TextBox
+                    mytextbox.Leave += txtBox_Leave_DisableSymbols;
+                }
 
 				string labelAnnot;
 				bool imgchld = false;
@@ -1311,8 +1316,13 @@ namespace ctlXMLEditLib
 				tb.Text = dfTxt;
 				tb.ForeColor = SystemColors.GrayText;
 			}
+
+			txtBox_Leave_DisableSymbols(sender, e);
         }
 
+        //B2026-085 Disable Symbols when leave a TextBox
+        private void txtBox_Leave_DisableSymbols(object sender, EventArgs e) => OnEnableDisableSymbolsBtn(new ctlXMLEditEventArgs(DisplaySymBolBtn:false));
+
 		// C2021-026 Event handler for Parent/Child child textbox
 		//           If the textbox is set to gray, then we are using the parent value
 		//           so clear the textbox so that user can enter the value for that child