Clarify Visible property (dotnet#7496)

Author: gewarren

xml/System.Windows.Forms/Control.xml

@@ -19868,14 +19868,16 @@ Note: This property will always return <see langword="true" /> for an instance o
       <Docs>
         <summary>Gets or sets a value indicating whether the control and all its child controls are displayed.</summary>
         <value>
-          <see langword="true" /> if the control and all its child controls are displayed; otherwise, <see langword="false" />. The default is <see langword="true" />.</value>
+          <see langword="true" /> to display the control and its child controls; otherwise, <see langword="false" />. The default is <see langword="true" />. When getting the value, <see langword="true" /> is returned only if the control is visible and the parent control, if it exists, is visible.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[  
 
-## Remarks  
- Note that even if `Visible` is set to `true`, the control might not be visible to the user if it is obscured behind other controls.  
-  
-   
+## Remarks
+
+If you set `Visible` to `true`:
+
+- The control might not be visible to the user if it's obscured behind other controls.
+- The control won't be displayed if the parent control is not visible.
 
 ## Examples  
  The following code example uses the derived classes <xref:System.Windows.Forms.VScrollBar> and <xref:System.Windows.Forms.HScrollBar> and sets their <xref:System.Windows.Forms.Control.Visible%2A> property values, based on the size of an <xref:System.Drawing.Image> being displayed in a <xref:System.Windows.Forms.PictureBox> control. This example requires that a <xref:System.Windows.Forms.PictureBox> has been created on a form and that <xref:System.Windows.Forms.HScrollBar> and <xref:System.Windows.Forms.VScrollBar> controls have been created on the <xref:System.Windows.Forms.PictureBox>. This code should be called when the image is loaded into the picture box and by the <xref:System.Windows.Forms.Control.Resize> event of the form.