OK, the display bug (display of window background on top) has gone. The panel displays grey there now, which looks way better.
WndClientRect: [0,0,279,154]
WndRect: [106,100,385,254]
ListViewRect: [106,100,385,254]
WndClientRect: [0,0,0,14]
WndRect: [110,100,110,114]
ListViewRect: [110,100,110,114]
WndClientRect: [0,0,707,191]
WndRect: [272,499,979,690]
ListViewRect: [272,499,979,690]
WndClientRect: [0,0,1020,253]
WndRect: [4,495,1024,748]
ListViewRect: [4,495,1024,748]
WndClientRect: [0,0,715,218]
WndRect: [268,476,983,694]
ListViewRect: [268,476,983,694]
WndClientRect: [0,0,1020,272]
WndRect: [4,476,1024,748]
ListViewRect: [4,476,1024,748]
Startup time : 0:10.211114
WndClientRect: [0,0,1020,251]
WndRect: [4,497,1024,748]
ListViewRect: [4,497,1024,748]
WndClientRect: [0,0,1020,272]
WndRect: [4,476,1024,748]
ListViewRect: [4,476,1024,748]
WndClientRect: [0,0,1020,251]
WndRect: [4,497,1024,748]
ListViewRect: [4,497,1024,748]
WndClientRect: [0,0,1020,272]
WndRect: [4,476,1024,748]
ListViewRect: [4,476,1024,748]
WndClientRect: [0,0,1020,251]
WndRect: [4,497,1024,748]
ListViewRect: [4,497,1024,748]
WndClientRect: [0,0,1020,272]
WndRect: [4,476,1024,748]
ListViewRect: [4,476,1024,748]