Hi Chris,

I will install the next official service pack after it is released.
Thank you very much for your quick answer.

Best regards
Frank

Hey Frank,

We have already addressed this issue internally in versions 2017.1 and 2017.2. So as long as you have a registered key, we can send you a link to the private patch with the fix. Simply create a new support case, referencing this forum thread, and we'll go from there.

As far as a workaround goes, the best option I foresee is simply replacing the existing DropDownButton of the UltraCombo/UltraComboEditor, with a DropDownEditorButton in the ButtonsRight collection. The editor buttons have a Width property that you can set once you determine the DPI.  The following code works well in my sample:

        private float scalingFactor;

        private void Form1_Load(object sender, EventArgs e)

        {

            using (Bitmap bmp = new Bitmap(1, 1))

            using (Graphics g = Graphics.FromImage(bmp))

            {

                scalingFactor = g.DpiX / 96f;

            }

            this.ReplaceDropDownButton(this.ultraComboEditor1);

            this.ReplaceDropDownButton(this.ultraCombo1);

        }

        private void ReplaceDropDownButton(UltraComboEditor comboEditor)

        {

            comboEditor.DropDownButtonDisplayStyle = Infragistics.Win.ButtonDisplayStyle.Never;

            var newButton = new DropDownEditorButton();

            newButton.Width = (int)(EditorWithComboDropDownButtonUIElement.defaultDropDownButtonWidth * scalingFactor);

            newButton.Click += (p1, p2) =>

                {

                    comboEditor.DropDown();

                };

            comboEditor.ButtonsRight.Add(newButton);

        }

        private void ReplaceDropDownButton(UltraCombo combo)

        {

            combo.DropDownButtonDisplayStyle = Infragistics.Win.ButtonDisplayStyle.Never;

            var newButton = new DropDownEditorButton();

            newButton.Width = (int)(EditorWithComboDropDownButtonUIElement.defaultDropDownButtonWidth * scalingFactor);

            newButton.Click += (p1, p2) =>

            {

                combo.PerformAction(UltraComboAction.Dropdown);

            };

            combo.ButtonsRight.Add(newButton);

        }

Let me know if you have any questions,

Chris

This is an image cut from a camera dialog.

Hi Chris,

We have been running into the same problem. We have observed if the UltraCombo/UltraComboEditor is set to Standard and AppStyling is not activated the width of the DropDownEditorButton does follow to the width of the VerticalScrollbar. But if AppStyling is activated, the width of the DropDownEditorButton is 14 pixels.  
Our customers are more and more using 4K displays and therefore we please need to have a workaround for this. If we could overwrite the width of the DropDownEditorButton at runtime it would help a lot.

Thank you very much indeed.     

Best regards
Frank

Hello Scott,

We had a number of discussions among the engineering staff about what how the DropDownEditorButton should be sized by default. In the end, we came to the conclusion, that we'd prefer the width of the DropDownEditorButton matches the width of the EditorButtons, instead of attempting the match the DropDownButton.

In any case, the workaround to get the DropDownEditorButton to match the DropDownButton (setting the Width property to 14) is pretty straightforward.

Let me know if you have any questions.