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copied!<p>I came up with a solution based on the article <a href="http://www.codeproject.com/KB/combobox/RadioListBoxDotNetVersion.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/combobox/RadioListBoxDotNetVersion.aspx</a>. My implementation inherits from CheckedListBox and includes the following methods:</p> <pre><code> protected override void OnDrawItem (DrawItemEventArgs e) { // Erase all background if control has no items if (e.Index < 0 || e.Index > this.Items.Count - 1) { e.Graphics.FillRectangle(new SolidBrush(this.BackColor), this.ClientRectangle); return; } // Calculate bounds for background, if last item paint up to bottom of control Rectangle rectBack = e.Bounds; if (e.Index == this.Items.Count - 1) rectBack.Height = this.ClientRectangle.Top + this.ClientRectangle.Height - e.Bounds.Top; e.Graphics.FillRectangle(new SolidBrush(this.BackColor), rectBack); // Determines text color/brush Brush brushText = SystemBrushes.FromSystemColor(this.ForeColor); if ((e.State & DrawItemState.Disabled) == DrawItemState.Disabled || (e.State & DrawItemState.Grayed) == DrawItemState.Grayed) brushText = SystemBrushes.GrayText; Boolean bIsChecked = this.GetItemChecked(e.Index); String strText; if (!string.IsNullOrEmpty(DisplayMember)) // Bound Datatable? Then show the column written in Displaymember strText = ((System.Data.DataRowView) this.Items[e.Index])[this.DisplayMember].ToString(); else strText = this.Items[e.Index].ToString(); Size sizeGlyph; Point ptGlyph; if (this.GetItemType(e.Index) == ItemType.Radio) { RadioButtonState stateRadio = bIsChecked ? RadioButtonState.CheckedNormal : RadioButtonState.UncheckedNormal; if ((e.State & DrawItemState.Disabled) == DrawItemState.Disabled || (e.State & DrawItemState.Grayed) == DrawItemState.Grayed) stateRadio = bIsChecked ? RadioButtonState.CheckedDisabled : RadioButtonState.UncheckedDisabled; // Determines bounds for text and radio button sizeGlyph = RadioButtonRenderer.GetGlyphSize(e.Graphics, stateRadio); ptGlyph = e.Bounds.Location; ptGlyph.X += 4; // a comfortable distance from the edge ptGlyph.Y += (e.Bounds.Height - sizeGlyph.Height) / 2; // Draws the radio button RadioButtonRenderer.DrawRadioButton(e.Graphics, ptGlyph, stateRadio); } else { CheckBoxState stateCheck = bIsChecked ? CheckBoxState.CheckedNormal : CheckBoxState.UncheckedNormal; if ((e.State & DrawItemState.Disabled) == DrawItemState.Disabled || (e.State & DrawItemState.Grayed) == DrawItemState.Grayed) stateCheck = bIsChecked ? CheckBoxState.CheckedDisabled : CheckBoxState.UncheckedDisabled; // Determines bounds for text and radio button sizeGlyph = CheckBoxRenderer.GetGlyphSize(e.Graphics, stateCheck); ptGlyph = e.Bounds.Location; ptGlyph.X += 20; // a comfortable distance from the edge ptGlyph.Y += (e.Bounds.Height - sizeGlyph.Height) / 2; // Draws the radio button CheckBoxRenderer.DrawCheckBox(e.Graphics, ptGlyph, stateCheck); } // Draws the text Rectangle rectText = new Rectangle(ptGlyph.X + sizeGlyph.Width + 3, e.Bounds.Y, e.Bounds.Width - sizeGlyph.Width, e.Bounds.Height); e.Graphics.DrawString(strText.Substring(4), e.Font, brushText, rectText, this.oAlign); // If the ListBox has focus, draw a focus rectangle around the selected item. e.DrawFocusRectangle(); } protected override void OnItemCheck (ItemCheckEventArgs ice) { base.OnItemCheck(ice); if (ice.NewValue == CheckState.Unchecked) return; if (this.GetItemType(ice.Index) == ItemType.Radio) // if they selected a root, deselect other roots and their children { for (Int32 i = 0; i < this.Items.Count; ++i) { if (i == ice.Index) continue; if (this.GetItemType(i) == ItemType.Radio) { this.SetItemChecked(i, false); Int32 j = i + 1; while (j < this.Items.Count && this.GetItemType(j) == ItemType.Checkbox) { this.SetItemChecked(j, false); j++; } } } } else if (this.GetItemType(ice.Index) == ItemType.Checkbox) // they selected a child; select the root too and deselect other roots and their children { // Find parent Int32 iParentIdx = ice.Index - 1; while (iParentIdx >= 0 && this.GetItemType(iParentIdx) == ItemType.Checkbox) iParentIdx--; this.SetItemChecked(iParentIdx, true); } } protected ItemType GetItemType (Int32 iIdx) { String strText = this.Items[iIdx].ToString(); if (strText.StartsWith("(o)")) return (ItemType.Radio); else if (strText.StartsWith("[x]")) return (ItemType.Checkbox); throw (new Exception("Invalid item type")); } </code></pre>

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