Even though C1Zoom.AllowResizeByZoom is true, resizing form by zooming form will not work in these situations:
C1Zoom.InnerPanelLayoutMode is InnerPanelLayoutMode.None.
C1Zoom.ZoomPreviewMode is ZoomPreviewMode.NoPreview.
Pinch zoom when C1Zoom.ZoomPreviewMode is ZoomPreviewMode.AlternativeContent.
Set ZoomFactor by C1Zoom.SetZoomFactor.
The ownerForm's System.Windows.Forms.Form.IsMdiContainer is true.