I do something similar here, perhaps you can spot some discrepancy?
// Instantiate a special buttonCell that can be drawn in color and
configure it
CCDColoredButtonCell *colorCell = [[CCDColoredButtonCell alloc]
init];
[colorCell setButtonColor:[NSColor clearColor]];
[colorCell setButtonType:NSMomentaryPushInButton];
[colorCell setBezelStyle:NSShadowlessSquareBezelStyle];
[colorCell setFont:[NSFont systemFontOfSize:15]];
[colorCell setAllowsMixedState:YES];
[colorCell setTarget:self];
[colorCell setAction:@selector(myAction:)];
[colorCell autorelease];
// Initial size of the buttons matrix
float mSize = 37 * squares - 2;
// Create the matrix of tri-state color capable buttons
protoMatrix = [[NSMatrix alloc] initWithFrame:NSMakeRect(20, 60,
mSize, mSize)
mode:NSHighlightModeMatrix
prototype:colorCell
numberOfRows:squares
numberOfColumns:squares];
[protoMatrix setIntercellSpacing:NSMakeSize(5, 5)];
[protoMatrix setCellSize:NSMakeSize(32, 32)];
[protoMatrix sizeToCells];
[protoMatrix autorelease];
// Disable unused cells, set tag and title of the visible ones
[self configureMatrix];
Create a NSTextFieldCell and customize it. Create a NSMatrix using
the "prototype" init version, and display it. All the custom
formatting is gone - all cells are vanilla NSTextFieldCells.
Loop through the matrix, and set each cell to a copy of the cell I
used as a prototype, using the "putCell..." method. Now it works fine.
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