V6.4: (28 Sep 2016)

• Fixed #622: [BREAKING CHANGE] Removed all 16x16 fixed sized checkbox-imagelists. The property CheckImageKind supports the values ckSystemDefault and ckCustom only and should be considered deprecated.
• Fixed #640: Edit control for in-place editing wrongly scaled in high-dpi scenarios
• Fixed #627: It should be possible to use OnGetImageIndexEx without having imagelists assigned
• Added assertion that verifies if an imageindex is supplied but no valid imagelist is available for this imageindex
• Fixed #148: Background Images now support other formats than just bitmaps.
• Fixed #623: GetHint calculates wrong width for HintText
• Fixed #633: High dpi scaling was performed two times
• Fixed #544, #427: Header painting problem with BiDiMode right to left
• TBaseVirtualTree.EnsureNodeSelected() only scrolls the selected node into the view, if no one was previously selected.
• Fixed #248: VT Header draws smudged
• Fixed #643: VT Header dropmark appears even if dragged column won't change position
• Fixed #310: Incorrect selection paint when toAutoSpanColumns, toGridExtensions and toExtendedFocus are set
• Fixed #653: GetFirstVisibleChild/NoInit check for wrong node if IncludeFiltered=True (thx to A. Hausladen)
• Fixed #659: GetLastVisibleChild/NoInit checks wrong node
• Fixed #647: New option to set the way of selecting next cell for editing in grid mode
• Fixed #645: Can't link 64 bit VCL app with VirtualTreeView in C++ Builder 10.1 Berlin
• Fixed #656: Fixed memory leaks in Advanced Demo
• Enhancement #631: Added new Demo project CharityEvents to demonstrate the use of Interfaces for node's data and for data presentation
• Fixed #658: Column Header does not paint correctly after a drop in certain conditions
• Fixed #639: Scrolbars are not correctly themed under certain cirumstances when using a VCL theme.
• Fixed #624: Wrong y-postion of checkboxes in high-dpi display mode
• Fixed #548: Add flag coStyleColor to TVirtualTreeColumn.Options (prefer background color of VCL style over TVirtualTreeColumn.Color)
• Fixed #660: Fix AV when tree is modified in OnEdited event
• Some minor tweaks on Virtual TreeView source code and sample projects