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copied!<p>As an update to the Miral's answer.. here are a few of the "missing steps", for someone new that's looking how to do this. :) The C# code above is almost 'drop-in' ready, with the exception of changing a few of the values to reference the UserControl that will be modified.</p> <p>Possible References Needed:<br/> System.Design (@robyaw)</p> <p>Usings needed:</p> <pre><code>using System.Windows.Forms.Design; using System.Windows.Forms.Design.Behavior; using System.ComponentModel; using System.ComponentModel.Design; using System.Collections; </code></pre> <p>On your UserControl you need the following Attribute:</p> <pre><code>[Designer(typeof(MyCustomDesigner))] </code></pre> <p>Then you need a "designer" class that will have the SnapLines override:</p> <pre><code>private class MyCustomerDesigner : ControlDesigner { public override IList SnapLines { get { /* Code from above */ IList snapLines = base.SnapLines; // *** This will need to be modified to match your user control MyControl control = Control as MyControl; if (control == null) { return snapLines; } // *** This will need to be modified to match the item in your user control // This is the control in your UC that you want SnapLines for the entire UC IDesigner designer = TypeDescriptor.CreateDesigner( control.textBoxValue, typeof(IDesigner)); if (designer == null) { return snapLines; } // *** This will need to be modified to match the item in your user control designer.Initialize(control.textBoxValue); using (designer) { ControlDesigner boxDesigner = designer as ControlDesigner; if (boxDesigner == null) { return snapLines; } foreach (SnapLine line in boxDesigner.SnapLines) { if (line.SnapLineType == SnapLineType.Baseline) { // *** This will need to be modified to match the item in your user control snapLines.Add(new SnapLine(SnapLineType.Baseline, line.Offset + control.textBoxValue.Top, line.Filter, line.Priority)); break; } } } return snapLines; } } } } </code></pre>

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