Strange button/layer problem

[Silmano]

I have a button in XML with the following code:

<Frames>
      <Button text="Sell" name="SellButton">
        <Size>
          <AbsDimension x="100" y="22" />
        </Size>
		<Layers>
			<Layer level="BACKGROUND">
				<FontString name="$parentSubText" inherits="GameFontNormalSmall" justifyH="LEFT"/>
			</Layer>
		</Layers>
        <Anchors>
          <Anchor point="TOPLEFT">
            <Offset>
              <AbsDimension x="0" y="0" />
            </Offset>
          </Anchor>
        </Anchors>
        <Scripts>
			<OnLoad>this:SetFrameLevel(this:GetFrameLevel() + 1);</OnLoad>
          <OnClick>SOM:Sell()</OnClick>
        </Scripts>
        <NormalTexture file="Interface\Buttons\UI-Panel-Button-Up">
          <TexCoords left="0" right="0.625" top="0" bottom="0.6875" />
        </NormalTexture>
        <PushedTexture file="Interface\Buttons\UI-Panel-Button-Down">
          <TexCoords left="0" right="0.625" top="0" bottom="0.6875" />
        </PushedTexture>
        <DisabledTexture file="Interface\Buttons\UI-Panel-Button-Disabled">
          <TexCoords left="0" right="0.625" top="0" bottom="0.6875" />
        </DisabledTexture>
        <HighlightTexture file="Interface\Buttons\UI-Panel-Button-Highlight" alphaMode="ADD">
          <TexCoords left="0" right="0.625" top="0" bottom="0.6875" />
        </HighlightTexture>
        <ButtonText name="$parentText">
          <FontHeight>
            <AbsValue val="10" />
          </FontHeight>
        </ButtonText>
        <NormalFont inherits="GameFontNormal" font="Fonts\FRIZQT__.TTF">
          <FontHeight>
            <AbsValue val="12" />
          </FontHeight>
          <Color r="1" g="0.8196079" b="0" />
          <Shadow>
            <Color r="0" g="0" b="0" />
            <Offset>
              <AbsDimension x="1" y="-1" />
            </Offset>
          </Shadow>
        </NormalFont>
        <HighlightFont inherits="GameFontHighlight" font="Fonts\FRIZQT__.TTF">
          <FontHeight>
            <AbsValue val="12" />
          </FontHeight>
          <Color r="1" g="1" b="1" />
          <Shadow>
            <Color r="0" g="0" b="0" />
            <Offset>
              <AbsDimension x="1" y="-1" />
            </Offset>
          </Shadow>
        </HighlightFont>
        <DisabledFont inherits="GameFontDisable" font="Fonts\FRIZQT__.TTF">
          <FontHeight>
            <AbsValue val="12" />
          </FontHeight>
          <Color r="0.4980392" g="0.4980392" b="0.4980392" />
          <Shadow>
            <Color r="0" g="0" b="0" />
            <Offset>
              <AbsDimension x="1" y="-1" />
            </Offset>
          </Shadow>
        </DisabledFont>
        <PushedTextOffset x="0" y="0" />
      </Button>
    </Frames>

When I first load the button it all goes well:

Button shows in the correct layer, its clickable and it calls the function when I click on it.

If I close the merchant window and reopened any other time, I find this:

Button is in the same layer, but merchant frame is now 5 layers above! So I cant see nor click on the button.

For showing/hiding the button I use the functions show() & hide().

Any clue on what can I do to solve this?

[Synthos]

try using Frame:Raise() when the merchant frame is shown.