Hi James,

The status of the item is changed to Declined. The reported behavior is the default one and a possible solution was suggested by Desislava.

Regards,
Dinko | Tech Support Engineer
Progress Telerik

Hi, James,

I understand what is your concern. However, no matter what tab is selected, the dialog has a currently selected color that is displayed in the Professional tab. That is why when the selected color is Transparent, the alpha value is set to 0. We can't consider this as an issue. But I can suggest an appropriate solution how to achieve the desired behavior:

        public RadForm1()
        {
            InitializeComponent();
            this.radColorBox1.Value = Color.Blue; 

            RadColorSelector selector = this.radColorBox1.ColorDialog.ColorDialogForm.RadColorSelector as RadColorSelector;
            selector.ControlsHolderPageView.SelectedPageChanged += ControlsHolderPageView_SelectedPageChanged;
        }

        private void ControlsHolderPageView_SelectedPageChanged(object sender, EventArgs e)
        {
            RadColorSelector selector = this.radColorBox1.ColorDialog.ColorDialogForm.RadColorSelector as RadColorSelector;
            if (selector.ControlsHolderPageView.SelectedPage.Text == "Professional")
            {
                Telerik.WinControls.UI.RadColorPicker.ProfessionalColors professionalColorsControl = selector.ControlsHolderPageView.SelectedPage.Controls[0] as Telerik.WinControls.UI.RadColorPicker.ProfessionalColors;
                ((RadSpinEditor)professionalColorsControl.Controls[0].Controls["numAlpha"]).Value = 255;
            }
        }

Please give it a try and see how it works for your case.

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik

Thus, whatever color is selected, it will change the current selection. However, after following the described steps which result in changing the selection to Transparent on the Web tab, note that the alpha value is set to 0.

It is necessary to set the A value to 255 in this case. Please give it a try and see how it works on your end.

Let me know what is the observed result.

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik